there was no immediate claim of responsibility, but such attacks are often a trademark of al- qaeda's iraqi wing. a major sell-off hit wall street today. stocks plunged after china reported its economic growth slowed in the first quarter, and commodity prices took a hit. the dow jones industrial average lost nearly 266 points to close at 14,599. the nasdaq fell 78 points to close at 3216. there was relative quiet out of north korea today, as the communist state celebrated the birthday of its founder with a flower festival. lebrations were focusein pyongyang, and residents dressed in their finest clothing to lay flowers before statues of former north korean leaders. a day earlier, north korea rejected the south's offer of dialogue, calling it a "crafty trick." a federal judge in washington has refused to intervene in a detainee hunger strike at guantanamo bay, cuba. he ruled today that federal law bars judicial review of enemy combatant claims of mistreatment. a yemeni prisoner, musaab al- madhwani, had said he and other hunger strikers are denied drinking water and medical care and ke